Disk cutter with bevelled and concave surfaces



June 19, 1951 E, FRANCK DISK CUTTER WITH BEVELLED AND CONCAVE SURFACEFiled June 29, 1946 6607 6 zflmzcz Patented June 19, 1951 TH BEVELLEDAND SURFACES DISK CUTTER WI CONCAVE George E. Franck, Riverside, Ill.,Brass Manufacturing a corporation of Illino Imperial cago, Ill.,

assignor to The Company, Chiis Application June 29, 1946, Serial No.680,344 4 Claims. (Cl. 7-141) A more particular object is to provide anew and improved tool which simultaneously performs two operations inthe formation of a double flare on tubing.

Another object is to provide a tool which, as an incident to performinga tubing cutting-01f A further object is to provide a tubing cuttingoiftool having a cutting wheel one face of which is formed to turn inwardlythe end of the tubing being cut.

lngs, in which:

Fig. 1 is a plan view of a tubing cutter embodying features of theinvention adapting it for use in forming a double flare on tubing; 3,piece of tubing being shown in section.

Fig. 2 is a side elevational view of the cutter of Fig. 1.

Fig. 3 is an enlarged over forming wheel.

Fig. 4 is a view taken from the right in Fig. 3.

Fig. 5 is a view similar to Fig. 4 taken from the left in Fig. 3.

Fig. 6 is a very greatly enlarged radial sectional view of the cuttingand forming wheel.

Fig. 7 is a view illustrating the partially formed tubing and means forperforming a further operation in the flaring of the tubing.

Fig. 8 is a view similar to Fig. 7 showing the double flare completed.

While a double flare edge elevational view, somewhat Figs. 1 and 2, ofthe cutting and scope of the invention as defined in the appendedclaims.

In system wherein thin-walled tubing, such as that shown at ID in Figs.1, 2, 7 and 8, is emplayed as, for example, in refrigeration systems, inthe automotive etc., a piece not been marred, bent, etc., therebyfacilitating the making of a fluid-tight coupling.

portion of a tubing being the part point of mechanical strength as wellas from the standpoint of facility of eflecting a fluid-tight a portionH at the very end of the tubing is turned inwardly in the neighborhoodof 40 from its original position to adapt it for being bent or foldedback upon the straight portion of the tubing on the inner side thereof.While it is conceivable, as above stated, that the steps be performedentirely independently, it is contemplated that steps one and two willbe performed somewhat simultaneously. Accordingly, as an incident to andat least following in immediate succession the cutting-off step, is theinitial inturning of the portion i i.

In the third step, the portion II is turned further inwardly and then isfolded back against the inner surfaces of the tubing Hi. The fourth andfinal step is to flare outwardly this portion ll of the tubing and aportion I! (see Fig. 8) which is slightly wider than the portion H. Hereagain, while it is conceivable that the portion Ii will first becompletely bent back upon the tubing Ill,

.it is preferable that this bending back of the portion II and theoutward flaring of that portion and the portion ll be performed in part,at least, simultaneously, for it will readily be appreciated that timeand effort can be saved in that way. Herein the first and second stepsof the method are disclosed as performed by a tool the particulars ofconstruction of which were conceived to carry out the first two steps inthis method, while the third and the fourth steps are carried out by theemployment of a conventional flarin tool.

Referring now to Figs. 1 to 6, inclusive, there is disclosed therein atubing-working tool devised to perform simultaneously a cutting-off anda partial forming operation, herein an inward flaring of the portion l Iof the tubing. The tool comprises a generally C-shaped body member l3.At one end, the body member I3 is shaped or carries means to form agroove extending transversely of the body for the partial reception of apiece of tubing Ill to be operated upon. Herein a pair of rollers H arerotatably mounted at the one end of the body member and facing inwardlyso as to form between them a groove for the partial reception of a pieceof tubing 10. At the other end, the body member is bored in the plane ofthe member for the reception slidably therein of a bar l of a length toproject out of the bore at both ends. The bar I5 is square and the borelikewise is square in transverse cross section so that the bar is heldagainst rotation. At its inner end, the bar carries means designed toperform the first and second steps of the method as the bar is fedtoward a piece of tubing supported between the rollers l4 and the toolas a whole is then revolved about the tubing. While the means forperforming the first and second steps of the method may be formeddirectly on the end of the bar l5, preferably this means is a separate,removable element. To that end, the end of the bar I5 is formed withbifurcations l6 and rotatably mounted between the bifurcations is acutting and forming element, herein a wheel l1.

As best seen in Figs. 3 to 6, inclusive, particularly Fig. 6, the wheelhas a peripheral severing edge It. To avoid nicking of the edge l8, itis not formed as a knife edge but is given a slight width being on theorder of .005 to .008 of an inch in width. This severing or cutting edgeis located very near one side face or face plane of the wheel, as isclearly seen from Figs. 3 and 6, more particularly, the left side asviewed in those figures. From the edge l8 the side face is falls awayvery rapidly by means of a beveled portion 4 which forms an angle ofapproximately 10 to 15 with the plane of the wheel. the wheel thusperforms a simple cutting-off operation. The portion of the wheel to theright of the severing edge It, still as viewed in Fig. 6, is, however,contoured to perform the second step of the method, namely, the turningin of the portion ll of the tubing. To that end, the surface 2| isformed as an are at least over the portion adjacent the severing edge I!and, herein, over the entire surface. It will be appreciated that thisare will be comparatively small, in the order of one-eighth of an inch,inasmuch as the wheel has a thickness in the order of .134 of an inchand an outside diameter of approximately nineteen thirty-seconds of aninch. The center point from which the arc is struck lies in the plane ofthe side face I! of the wheel outwardly of the wheel so that a tangentto the surface 2| at the intersection with the face l9 does not exceed aright angle. Preferably, as herein, it forms a right angle. A tangent toare 2| at the severing edge I! forms, as best seen in Fig. 6, an angleof approximately 30 with a perpendicular to the axis of the wheel. Asthe severing edge it cuts into the tubing Hi, the curved surface 2|will, of course, turn the end of the piece of tubing engaged by itinwardly progressively as the wheel l1 moves progressively inwardly ofthe tubing. The result, of course, is that the portion l I of the tubingis turned inwardly, as best seen in Fig. 1,

with the outer surface, particularly, forming a true radius. The wheeli1 will, of course, be made of a suitable material, such as steelhardened so as to retain a cutting or severing edge.

When, as herein, the wheel I! has a cutting or severing peripheral edgeI! of slight width, as distinguished from a knife edge, to protect itagainst ready nicking, there will be formed on one of the severed piecesof tubing, usually on the piece having the inturned portion II, a verythin burr l8 (see Fig. 1). It is, of course, not desirable that thisburr remain on the piece of tubing and it is preferable, thereof, thatthe same be removed. Where the tubing is copper, bronze, or some othersoft material, a few strokes of a file remove the burr l8 and at thesame time give the piece of tubing ill at the inturned end a squared-oi!end, as in Fig. '7. Such a squared-of! end is desirable to assure theproper reaction of the tubing in the subsequent steps, moreparticularly, the inturning of the curved portion ll. Where the tubingI0 is of steel, the same procedure may be followed or the tubing may beclamped in a vise and the end having the burr I8 given a blow with aflat-faced object. This will break off the burr l8 and will also gattemor square the end of the tubing, as in On the body I: over the outer endof the bore in which the bar 15 slides, there is rotatably mounted aknurled knob 22. This knob has such engagement with the bar l5 that uponrotation of the knob the bar is fed toward or away from rollers l4 andany piece of tubing that may be resting in the groove formed by therollers. The mode of use of a cutting-off tool is well known to thoseskilled in the art.

The tubing having now been cut off to the desired length and partiallyformed is now ready for the remaining two operations necessary tocomplete the formation of a double flare. As above stated, theseoperations herein are performed at least partially simultaneously. Tothat end, the tubing is now clamped between the bars 23 of anyconventional flaring tool, one part of a fitting having customarily beenslipped over the tube. The flaring tool yoke 24 is next brought intoplay and the screw 25 carrying the flaring cone 28 rotated so as tobring the cone into operative engagement with the end of the tubing. Asthe cone is forced gradually into the tubing, the portion II is firstbent inwardly and, as the cone 26 continues to be forced into thetubing, is bent back upon the portion I! of the tubing. At some timeduring this bending of the portion i I, first further inwardly and thenagainst the portion II of the tubing, the portion H and the portion l2are bent outwardly to form the outward flare, the bars 23 of the flaringtool being properly countersunk for that purpose. Eventually, when thecone 26 reaches the position shown in Fig. 8, the portion II will belying flat against the portion i2 and both portions will be flaredoutwardly, as shown in Fig. 8. Thus, by two simple operations, there hasbeen formed a piece of tubing with a double flare. The flaring tool maynow be removed and the tubing is ready for completion of the couplingoperation by a uniting of the parts of the coupling.

I claim as my invention:

1. An element for use in a tool for working tubing comprising a wheelhaving a narrow, peripheral, severing edge, a beveled face at one sideof said severing edge forming a small angle with a plane perpendicularto the axis of the wheel, and a concave surface at the other side ofsaid severing edge intersecting the adjacent side face of the wheel, thecurvature of the surface being such that a tangent thereto never exceedsa right angular position with respect to a plane perpendicular to theaxis of the wheel.

2. An element for use in a tool for working tubing comprising a wheelhaving a narrow, peripheral, severing edge, a beveled face at one sideof said severing edge forming a small angle witha plane perpendicular tothe axis of the wheel, and a surface at the other side of said severingedge formed as an arc with the center of curvature of the are lyingoutside of the wheel 6 in the plane of the side of said wheel remotefrom the severing edge.

3. An element for use in a tool for working tubing comprising a wheelhaving a narrow, peripheral, severing edge, a beveled face at one sideof said severing edge forming a small angle with a plane perpendicularto the axis of the wheel, and a concave surface at the other side ofsaid severing edge intersecting the adjacent side face of the wheel, thecurvature of the surface being such that a tangent thereto at the pointof intersection of said surface and said adjacent side face formssubstantially a right angle with respect to a plane perpendicular to theaxis of the wheel.

4. An elementfor use in a tool for working tubing comprising a wheelhaving a narrow, peripheral, severing edge, a beveled face at one sideof said severing edge forming a small angle with a plane perpendicularto the axis of the wheel, and a concave surface at the other side ofsaid severing edge intersectiong the adjacent side face of the wheel,the curvature of the surface being such that a tangent thereto at anypoint forms an angle with respect to a plane perpendicular to the axisof the wheel falling in the range 30 to GEORGE E. FRANCK.

REFERENCES CITED The following references are of record in the flle ofthis patent:

UNITED STATES PA'I'EN'I'S

